Quick answers
- Which hospitals does Marissa M. Stoeffler work at?
- Medicare's official clinician data lists Marissa M. Stoeffler at 1 hospital: MercyOne North Iowa Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marissa M. Stoeffler see patients?
- Medicare's clinician data lists 4 practice locations, including Mason City, IA and Clinton, IA. Call before your visit to confirm the address.
- What is Marissa M. Stoeffler's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Marissa M. Stoeffler accept Medicare assignment?
- Yes. Medicare's clinician data says Marissa M. Stoeffler accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Marissa M. Stoeffler?
- (225) 239-7190, as listed in official Medicare / NPI Registry data.
- What is Marissa M. Stoeffler's NPI number?
- 1033980065. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marissa M. Stoeffler works
Medicare's Facility Affiliation Data lists Marissa M. Stoeffler at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- MercyOne North Iowa Medical CenterMason City, IA · Acute Care Hospital · CCN 160064
Practice locations
Addresses where Marissa M. Stoeffler is enrolled with Medicare (CMS data updated 2026-10-02).
- 1000 4th St SWMason City, IA 50401
- 1631 4th St SW, Suite 114Mason City, IA 50401 (225) 239‑7190
- 2400 Lillian WayClinton, IA 52732 (225) 239‑7190
- 621 S Illinois Ave, 100 Mercyone Regency Family MedicineMason City, IA 50401 (641) 428‑6900
Group practices
Medicare enrollment lists Marissa M. Stoeffler as a member of these groups (CMS data updated 2026-10-02).
- North Iowa Mercy Clinics302 clinicians in the group
- MercyOne Urgentcare18 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Mason City
Clinicians with the same Medicare primary specialty in Mason City, IA — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2023 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1033980065 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians